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  • br therapies and or interventions e g mechanical heart

    2022-08-17

    
    therapies and/or interventions (e.g. mechanical heart valves). Multidis-ciplinary discussion between the treating oncologist and cardiologist and with the surgery team is mandatory.
    3. Cardiotoxicity of selected/clinically relevant cancer therapies
    The cardiotoxicity of cytotoxic agents e.g. anthracyclines or high doses of alkylating agents, and radiation fields involving thorax, ATP and critical vascular structures has long been appreciated [3,14,15]. However, the adverse effects of novel treatments, such as protein kinase inhibitors and immune checkpoint inhibitors (ICI, Supplementary Table 1), and algorithms for their optimal management remain an area of study.
    3.1. Radiotherapy
    With the favorable development of long-term survival in certain cancers the toxic effects of chest irradiation have become appreciated. The relative contribution of radiation vs. chemotherapy can often only be estimated. Radiotherapy is used in about 35% of cancer patients within one year of diagnosis, provided that there is an adequate infra-structure [21]. Pericarditis can occur early after high dose radiotherapy and has long been the only quantitatively considered radiotoxicity to the heart, with a risk of 5% at 5 years after doses of 40 Gy to the whole organ with conventional fractionation [22]. Pericarditis may present in its effusive or constrictive form, and the latter is difficult to diagnose [23]. Acute pericarditis has become rare due to advances in radiation techniques and is characterized by massive immune infiltration and ex-udation. Chronic pericarditis, however, is one of the most frequent radiation-induced cardiotoxicities and also occurs following low-dose radiation [24]. Twenty percent of patients with chronic pericarditis de-velop clinical signs of constriction. The diagnostic workup includes echocardiography and invasive hemodynamics [25], and complete sur-gical pericardiectomy remains the definite therapy. Radiation dose limits for pericarditis were employed in contemporary trials on defini-tive radio-chemotherapy for lung cancer [26]. With the advent of 3D conformal treatment planning in radiotherapy, dose distributions within the heart are calculated before radiotherapy [27]. Meanwhile, long-term follow-up of larger cohorts of patients with tumors of good prognosis, particularly breast cancer and Hodgkin's lymphoma, are available. Dose-dependent adverse effects of radiotherapy on the heart manifest as ischemic heart disease [28], valvular heart disease, cardio-myopathy and congestive heart failure [29].
    Ischemic heart disease is the most common adverse cardiovascular event after radiotherapy for breast cancer [28]. Ionizing radiation expo-sure of the heart increases the individual patient's base line risk of ische-mic heart disease by 7.4% per Gy mean heart dose, and this excess relative risk remains rather constant during follow-up until 20 years after radiotherapy. Comorbid patients with preexisting cardiac risk fac-tors have a larger absolute excess risk of ischemic heart disease than pa-tients without risk factors after the same radiation exposure. The ‘Early Breast Cancer Trialists' Collaborative Group’ analyzed the risk of heart disease in N40,000 women from 75 trials randomized to breast cancer radiotherapy vs. no radiotherapy [30] and found an increase in the rel-ative risk of cardiac mortality of 4.1% per Gy mean heart dose [30]. The most common cause of radiation-dependent cardiac mortality in this analysis was ischemic heart disease followed by heart failure and valvu-lar ATP disease. Comparing toxicities in patients who receive tangential field radiotherapy for left-sided versus right-sided breast cancer, an in-creased risk of cardiac mortality was found in patients treated with left-sided radiotherapy [31].
    Mediastinal radiotherapy for Hodgkin's lymphoma is usually given by opposing ap-pa fields. As a consequence, the dose distribution in the heart differs from that in breast cancer patients with a higher expo-sure of the atrio-ventricular annular plane. The excess relative risk of valvular heart disease increased by 2.5% per Gy for doses ≤ 30 Gy, and